JPH06217111A - Processor including patch edition for image - Google Patents

Abstract

PURPOSE:To prevent the degradation of picture quality caused by reencoding inside a patched image by storing a phase corresponding to the block boundary of the patched image and performing the patch at a position matched with that phase. CONSTITUTION:Corresponding to an instruction, two images are displayed on a CRT display 3. Corresponding to the guide of the display 3, a CPU 1 designates an upper left edge and a lower right edge to segment an image for segment with a mouse (keyboard) 10. These coordinates are stored in a main memory 2 as the segmenting image. On the other hand, the CPU 1 stores the low-order three bits of the upper left edge coordinate in the memory 2 as a relative position inside a unit block. Then, the image to be moved is selected and moved by the mouse 10, and the patch position is instructed. Then, the low-order three bits of this upper left coordinate are compared with those of the moved image and when they are coincident, it is judged that this image is valid. Thus, since the phase of the segmenting image is stored and the patch is performed when this phase is matched with the boundary line of the moving image, the block boundary of re-encoding is matched with that of encoding. Therefore, the degradation of picture quality can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is one in which at least the first image is subjected to a pixel block operation accompanying compression and decompression when the first image is cut and pasted to the second image. The present invention also relates to an image processing apparatus in which a second image in which the first image is cut and pasted is also subjected to a pixel block forming operation associated with compression and expansion.

[0002]

2. Description of the Related Art In recent years, an algorithm as a standardization proposal for encoding an image in pixel block units of 4 × 4 pixels, 8 × 8 pixels, etc. has been proposed by JPEG (Joint Photographic Exp
erts Group). This is an algorithm for data encoding and decoding of color still images and grayscale still images, that is, data compression and decompression.

The basic system of the algorithm is shown in FIG.
As shown in 2, it is a lossy conversion system of compression and expansion. During compression, the Discrete Cosine transform
Transform) (DCT transformation), quantization, and entropy coding operations are sequentially executed, and at the time of decompression, each step includes entropy decoding, dequantization, and inverse DCT transformation. Also, some other coding methods using DCT transformation have been proposed. DCT is a known technique and is described, for example, on pages 124-129 of October 15, 1990, published by Nikkei Electronics. In the JPEG system, the image is m × n
It is encoded in units of blocks of pixels. In the following description of this specification, m = 8 and n = 8 will be described.

Although the basic system of JPEG is lossy conversion, even if compression-saving-expansion is repeated for the same image, if the block boundaries of pixel block formation are constant, the image quality of the re-encoded image is No deterioration occurs.

[0005]

However, there is a problem in further attempting to compress and store a composite image formed by cutting and pasting the compressed and expanded image. The blocked image G1 shown in (a) of FIG. 13 is an image that has been blocked in units of 8 × 8 pixels due to the encoding at the time of compression. When the image B1 is cut out from the blocked image G1 into a size of 4 blocks × 5 blocks, it is cut out along the block boundaries when encoded as shown in the figure. When this composite image G2 is compressed by re-encoding after the image B1 is pasted at a predetermined position of the image G2 shown in FIG. 13B, the image G2 is divided into blocks. The block boundary does not coincide with the block boundary indicated by the dotted line of the blocked image B1 to which the pasted block B1 is attached, and the block boundary is displaced as illustrated. The reason is that when the image B1 is pasted on the image G2, the respective block boundaries cannot be seen by the operator. If the block boundaries coincide with each other and the scale factors are the same, image quality deterioration due to re-encoding does not occur, but if the cut-and-paste editing is performed with the block boundaries shifted as shown in FIG. 13B. However, there is a drawback that the image quality deteriorates each time the cut-and-paste editing-compression-save-expansion is repeated.

Considering the phase of the coordinate position at each block boundary of the image B1 with reference to the block boundary of the image G2,
When the boundaries of the blocks of the images G2 and B1 before and after cutting and pasting, that is, the phases do not match, the image quality deterioration as described above occurs. Here, the phase is represented by lower 3 bits of the X and Y coordinates of each pixel of the image B1 in each block of the image G2 when the size of one encoded block is 8 pixels × 8 pixels. And takes values from (0,0) to (7,7). Here, (0,0) and (7,7) indicate coincidence of phases. For example, the phase of the point P in FIG. 9B is (6,
4).

Therefore, the present invention has been made in view of the problem that the quality of an image deteriorates when the operations of cutting, pasting, compressing, and expanding a composite image obtained by cutting and pasting a blocked image are repeated. It is an object of the present invention to provide an image processing device capable of preventing the occurrence of image quality deterioration in a device in which encoding and decoding are repeatedly performed in block units of pixels in a matrix for image data.

[0008]

An image processing apparatus according to one aspect of the present invention has first and second display areas for displaying an image corresponding to image data, and displays in the first display area. Display means for displaying the displayed image in the second display area, and the image data displayed on the display means is encoded in block units of m × n pixels, and the image data of the displayed image is decoded. Encoding / decoding means for converting,
Let (X, Y) be the coordinates of the first point of the image displayed in the first display area, and (x, y) display the image displayed in the first display area in the second display area. When the coordinates of the second point corresponding to the first point are defined as follows, the coordinates (x, y) of the second point satisfying X mod m = x mod m Y mod n = y mod n are calculated. Means for displaying, the image displayed in the first display area and the image displayed in the second display area by the encoding / decoding means.
The image displayed in the first display area is displayed in the second coordinate (x, y) calculated by the calculating unit so as to be encoded / decoded in block units of × n pixels. And a control unit for displaying in the display area.

An image processing apparatus according to another aspect of the present invention has first and second display areas for displaying an image corresponding to image data, and displays an image displayed in the first display area as a first image. Display means for displaying in the second display area, and encoding / encoding the image data displayed on the display means in block units of m × n pixels and decoding the image data of the displayed image. Decoding means and (X, Y) first
The coordinates of the first point of the image displayed in the display area of
When (x, y) is the coordinate of the second point corresponding to the first point when the image displayed in the first display area is secondly displayed in the display area, X mod m = x mod m Y mod n = y mod n means for calculating the coordinates (x, y) of the second point, cursor display means for displaying a cursor on the second display area, and the cursor Is moved to a desired position in the second display area, a means for specifying a desired position in the second display area using the cursor moved by the cursor moving means, and the specification means. The means for determining the coordinates (x, y) closest to the desired position, the image displayed in the first display area, and the image displayed in the second display area by the encoding / decoding means. In order to be encoded / decoded in block units of m × n pixels, the first Second coordinates calculated by said calculating means an image displayed on the display region (x, y) a second depending on the
And a control means for displaying in the display area.

Further, the image processing apparatus of the present invention has first and second display areas for displaying an image corresponding to the image data, and the image displayed in the first display area is the second.
Display means for displaying in the display area, and encoding / decoding for encoding the image data displayed on the display means in m × n pixel block units and for decoding the image data of the displayed image. And (X, Y) are the coordinates of the first point of the image displayed in the first display area,
When (x, y) is the coordinate of the second point corresponding to the first point when the image displayed in the first display area is secondly displayed in the display area, X mod m = x mod m Y mod n = y mod n means for calculating the coordinates (x, y) of the second point, cursor display means for displaying a cursor on the second display area, and the cursor A second display area using a cursor moving means for continuously moving the cursor to the second coordinate (x, y) position calculated by the second display area calculating means, and a cursor moved by the cursor moving means. Means for designating a desired position, and the image displayed in the first display area and the image displayed in the second display area are encoded by the encoding / decoding means in block units of m × n pixels. The image displayed in the first display area so as to be encoded / decoded. By comprising control means for displaying second coordinates calculated (x, y) in the second display area in response to the means exit, a characterized.

[0011]

According to the present invention, the original image is displayed in the first display area and the edited image is displayed in the second display area in the case where the image data is encoded and decoded in blocks of a predetermined pixel unit. , Storing the cut-out position of the original image displayed in the first display area with respect to the block boundary position, designating the pasting position of the edited image displayed in the second display area, and pasting in the designated block Coordinate position (X, Y)
Then, the coordinates (x, y) of the second point are calculated so that the stored coordinate position (x, y) of the cutout satisfies X mod m = x mod m Y mod n = y mod n It is the one.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the schematic arrangement of the image processing apparatus according to this embodiment. This image processing device
A CPU 1 for performing various controls, a main memory 2 for storing control programs for the CPU 1, a CRT display 3 for displaying images, a display memory 4 for storing images to be displayed on the CRT display 3, and encoding and decoding of image data. An encoder / decoder 5, a magnetic disk 6 for storing images, for example, a magnetic disk device 7 for handling a hard disk,
A scanner 8 for reading an original image, a printer 9 for printing out on paper, a mouse 10 (or keyboard) as an input means for instructing an edit mode, cutting coordinates and pasting coordinates, and a network for connecting to an external device The communication interface 11 and the bus 12 connecting the respective units.

Instead of the magnetic disk 6, another storage medium such as an optical disk device (ODD) is used, or a network connected to the communication interface 11.
A remote file connected via a network may be used.

In the encoder / decoder 5, one image data is represented by 640 × 512 pixels, one pixel is represented by 8 bits of density (Y) and 4 bits of chromaticity (I, Q). Further, the processing in the encoder / decoder 5 is performed in block units by dividing 640 × 512 pixels into blocks of 8 × 8 pixels.

The encoder / decoder 5 is composed of an encoder that encodes an input image in block units and a decoder that restores (decodes) the encoded image in block units. For details, see, for example, JP-A-3-25.
Since it is described in Japanese Patent No. 6454, it is omitted here.

The decoding / decoding device 5 is a magnetic disk 6
Decrypt when reading and displaying the file stored in. The image data is loaded into the display memory 4 from the network connected to the scanner 8 or the communication interface 11 and displayed on the CRT display 3. At the time of compression-saving, the image data stored in the display memory 4 is encoded by the encoder / decoder 5 and stored in the magnetic disk 6 in the magnetic disk device 7.

At the time of expansion, conversely, the encoded data is read from the magnetic disk 6 in the magnetic disk device 7 and encoded / encoded.
The image data is decoded by the decoder 5 and sent to the display memory 4.

The user edits the image by cutting and pasting while using the mouse 10 or the like while looking at the CRT display 3. The principle of this editing method will be described with reference to FIGS. In FIG. 2A, the encoded image data stored in the magnetic disk 6 in the magnetic disk device 7 is read and decoded, and then stored in the display memory 4, and the CRT is displayed.
It is an image displayed on the display 3. The displayed image G1 is divided into blocks of 8 × 8 pixels when decoded by the encoder / decoder 5. The figure shows 8x
8 pixel blocks b are arranged in the X direction and 11 in the Y direction. When the cut-out image B1 is cut out from this image G1, the user uses the mouse 10 to select a specific point of the cut-out image B1, for example, the point P1 at the upper left corner.
Click while watching the RT display 3
The position coordinate (x1, y1) of No. 1 on the display memory 4 is stored in the main memory 2.

On the other hand, the block bp including this point P1
The phase of the point P1 with respect to the block boundary of is obtained and stored. This phase is represented by the pixel position corresponding to the point P1 in the block bp1. In the case of FIG. 2A, since the block size is 8 × 8 pixels, the phase is the lower 3 of the X and Y coordinates.
It can be expressed in bits. Assuming that the pixel at the upper left corner of the block bp1 is (0, 0), the position (phase) of the pixel corresponding to the point P1 is the sixth position in the X direction and the fourth position in the Y direction. Become.

Next, the point P1 at the upper left corner and the point P2 at the lower right corner of the image B1 are clicked by using the mouse 10 to perform address designation on the display memory 4, and the data of the image B1 is read out, as shown in FIG. As shown in (b) of
The mouse is moved to a position above the edited image G2 displayed on the T display 3 and the position is adjusted using the mouse 10. At this time, if the edited image G2 is read from the magnetic disk 6, it is divided into blocks of 8 × 8 pixels by the encoding / decoding processing. However, since the block boundary line due to this block formation cannot be seen on the edited image G2 displayed on the CRT display 3, when the cut image B1 is pasted on the image G2, for example, the point P1 is desired to be on the image G2. Even if it is clicked according to the position, it is extremely rare that the phase of the upper left point P1 of the image G1 with respect to the block bp2 of the image G2 becomes the same phase (6, 4) in the block bp1 of the image G1. . Position P1 in image G2
Exists in the block bp2 of 8 × 8 pixels, and is pasted at any one of such positions, and is aligned with the block boundary as described later.

Since the cut-out image B1 and the edited image G2 are mixed in the shaded block shown in FIG. 2B, image quality deterioration may occur due to re-encoding of this composite image. However, the 3 × 4 non-shaded blocks inside the cut-out shaded block of the image B1 do not deteriorate because the block boundaries at the time of encoding the image G1 are preserved.

The resolution of the image G2 is, for example, 16 lines / mm.
If it is (16 pixels / mm), the shaded area consisting of 8 × 8 pixel blocks has a width of 0.5 mm in both the X and Y directions, and within this 0.5 mm, the position (phase) is aligned with the block boundary. However, the operator hardly notices that the position specified by him / her has changed and it is not a big problem.

The calculation of the coordinates for matching the cut-out image B1 with the block position of the pasted edited image G2 is performed as follows. Here, the block size is 8 × 8 pixels.

Generally, a point P (x, y) on the cut image
The phase of (x, y is the x, y coordinates of this point) is calculated as (x mod8, y mod7) (mod represents the operation of mod (Modu)).

The closest phase matching position of the block with respect to the point P is P1, P2, P3, and P4 which are the phase matching positions of the upper left, upper right, lower left, and lower right of the block surrounding P.
The distance from ~ P4 is d1 ~ d4, and the minimum distance is m
in (d1, d2, d3, d4).

Here, P (x, y) and P1 (x1, y1
) The distance d1 between is d1 = ((x-x1) 2 + (y-y1) 2) 1/2. The remaining distances d2-d4 are similarly obtained.

Next, the cut and paste operation will be described with reference to the flow chart shown in FIG. 3 and the state change diagrams shown in FIGS. For example, image data read by the scanner 8, image data read from the magnetic disk 6 and decoded by the encoder / decoder 7, or image data externally supplied by the communication interface 11 is stored in the display memory 4. An image G1 is displayed on the stored CRT display 3.
(See FIG. 4A) In such a state, the mouse 10 is used to instruct cutting and pasting of the image in the edit mode. Then, the CPU 1 guides the CRT display 3 to select whether to cut and paste within the same screen or different screens.

When the cut and paste for different screens is selected by the mouse 10 in accordance with this guidance, the CPU 1 causes the CR
The T display 3 guides the reading of other images. In response to this guidance, the mouse 10 is instructed to display a different image G2. The different image is an image read by the scanner 8, an image read from the magnetic disk 6 and decoded by the encoder / decoder 7, or an image supplied from the outside by the communication interface 11.

In response to the instruction, two images G1 and G2 are displayed on the CRT display 3 as shown in FIG. 4 (c). Next, the CPU 1 uses the CRT display 3
, Move the cursor to the upper left corner of the image to be clipped,
Please give instructions to execute. " In response to this guidance, the upper left end of the cutout image [A] displayed on the screen is specified by the mouse 10 (see FIG. 4A).

Next, the CPU 1 uses the CRT display 3
, "Move the cursor to the lower right corner of the image to be clipped,
Please give instructions to execute. " In accordance with this guidance, the lower right corner of the image on which the image [A] for clipping is displayed is specified by the mouse 10 (see FIG. 4B).

The cut-out range as the designated coordinates is cut-out image B1 by the CPU 1 into the main memory 2
Memorized in. Further, the CPU 1 causes the image B to be cut out.
The lower-order 3-bit coordinate data of the upper left corner of 1 is stored in the main memory 2 as a relative position in the unit block (coordinate position in the block).

For example, in the case of FIG. 2A, the X and Y coordinates as the relative position in the unit block bp1 are (6, 4) as described above. Next, when the moving mode of the image is selected by the mouse 10, the CPU 1 guides on the CRT display 3 "select an image to move, move to a position to paste the image, and instruct execution". I do. In response to this guidance, the mouse 10 selects the moving image B1, moves the image B1, and gives an instruction at the pasting position in the image G2. (Fig. 4 (c), (d),
(See (e)).

As a result, the CPU 1 sets the lower 3 bits of the coordinates of the upper left end position to be pasted, and the lower 3 bits of the upper left end of the cut-out image B1 stored in the main memory 2.
The bit position is compared, and if the phases match, the pasting position is validated. If the phases do not match, the closest position on the block where the phases match is found and that position is validated.

As a result, the CPU 1 reads out the image corresponding to the cutout position from the display memory 4 and stores the image in the display memory 4 corresponding to the pasting position. As described above, since the phase of the cut-out image is stored and the pasting is performed at the position where the phase coincides with the block boundary line of the pasted image, the shaded area in FIG. As for the non-diagonal block inside the block (peripheral part of the pasted image), of course, the block boundary of re-encoding also matches the block of re-encoding even for the block indicated by diagonal lines, so image quality does not deteriorate. .

As will be described later in detail, as another embodiment, when the cursor is moved when the pasting position is designated, the position is discontinuous from the position where the phase matches to the position where the phase matches next. Similar results can be obtained by restricting the movement to. For example, in the flowchart of FIG. 3, instead of moving the clipped image on the edited image and instructing to paste, the lower 3 bits of the X and Y coordinates of the pixel on the edited image where the pixel at the upper left corner of the clipped image overlaps Then, the clipped image is moved until the position where the phase match is obtained.

In this way, since the position where the movement is permitted, that is, the position where the phases coincide with each other, the user may instruct the attachment at any position. Further, as another embodiment, when the image is cut out, its boundary may be made to coincide with the boundary of the coding block. The block size is 8x8 pixels, so when you look at each of the lower 3 bits of the X and Y coordinates, 7 and 0
The boundaries will be cut out.

The lower 3 bits of the X and Y coordinates of the upper left corner pixel of the clipped image are always (0, 0), and the lower 3 bits of the X and Y coordinates of the lower right pixel are always (7, 7). . Then, move this image over the image to be pasted and align it.
As with the cutout, paste is performed according to the block boundaries. For example, in the pixel of the edited image at the position where the pixel at the upper left corner of the cut-out image is overlapped, the lower 3 bits of each of the X and Y coordinates must be (0, 0). The cutout image and the pasted image are as shown in FIGS. 5 (a) and 5 (b), for example.

Consider re-encoding of the image thus synthesized. Since all blocks have the same block boundaries as the previous encoding and there is no phase shift, compression-
Image quality deterioration due to phase shift does not occur even if storage-expansion-edit is repeated.

Next, the operation of the above structure will be described with reference to the flow chart shown in FIG. 6 and the state change diagrams shown in FIGS. 4 (a) to 4 (e). For example, now
An image read by the scanner 8, an image read from the magnetic disk 6 and decoded by the encoder / decoder 7, or an image G1 supplied from the outside by the communication interface 11 is stored in the display memory 4 and stored in the CRT display 3 Is displayed.

In such a state, the mouse 10 is used to instruct cutting and pasting of the image in the edit mode. Then, the CPU 1 guides the CRT display 3 to select whether to cut and paste within the same screen or different screens.

When the cut and paste for different screens is selected by the mouse 10 in accordance with this guidance, the CPU 1 causes CR
The T display 3 guides the reading of other images. In response to this guidance, the mouse 10 is instructed to display a different image G2. The different image is an image read by the scanner 8, an image read from the magnetic disk 6 and decoded by the encoder / decoder 7, or an image supplied from the outside by the communication interface 11.

In response to the instruction, the two images G1 and G2
Is displayed on the CRT display 3 as shown in FIG. Next, the CPU 1 guides the CRT display 3 by "moving the cursor to the upper left corner of the image to be cut out and instructing execution". In response to this guidance, the upper left end of the cutout image in the screen where the cutout image is displayed is designated by the mouse 10 (see FIG. 4A).
At this time, at the upper left corner of the cutout position, a pixel in which the lower 3 bits of each of the X and Y coordinates near the designated coordinate is (0, 0) is selected. The pixels exist every 8 pixels both vertically and horizontally.

Next, the CPU 1 uses the CRT display 3
, "Move the cursor to the lower right corner of the image to be clipped,
Please give instructions to execute. " In response to this guidance, the mouse 10 is used to point to the lower right corner of the screen in which the image for clipping is displayed (see FIG. 4).
(See (b)). At this time, at the lower right end of the cutout position, a pixel in which the lower 3 bits of each of the X and Y coordinates in the vicinity of the designated coordinate is (7, 7) is selected.

The CPU 1 stores the cut-out range as the designated coordinates in the main memory 2. Next, when the movement mode of the image is selected by the mouse 10,
The CPU 1 guides on the CRT display 3 "Select an image to be moved, move to a position where the image is pasted, and instruct execution". In response to this guidance, the mouse 10 selects an image to be moved, moves the image, and designates it at the pasting position (Figs. 4 (c), (d),
(See (e)). At this time, at the upper left corner of this pasting position, a pixel in which the lower 3 bits of each of the X and Y coordinates in the vicinity of the designated coordinate is (0, 0) is selected. At the lower right end of this pasting position, a pixel in which the lower 3 bits of each of the X and Y coordinates in the vicinity of the designated coordinate is (7, 7) is selected.

As a result, the CPU 1 reads out the image corresponding to the cut-out position from the display memory 4 and stores the image in the display memory 4 corresponding to the pasting position. As described above, when cutting and pasting an image, the image is cut out with the block to be coded as a boundary, and is also pasted with the same block as the boundary, that is, the cut and paste is performed according to the block boundary, so re-coding However, since the same block as the previous encoding is the target, the image quality deterioration due to the phase shift does not occur.

In this way, when designating the pasting position,
When the cursor is moved, the same result can be obtained by restricting the discontinuous movement from the position satisfying the condition to the position satisfying the next condition. In this way, the position where the movement is permitted, that is, the position satisfying the respective conditions is performed.

In this case, the position where the cutting and pasting is performed is not limited to a unit of one pixel but is limited to, for example, every eight pixels, but this is not a serious problem. Eight pixels has a small value of 1 mm at a resolution of 8 lines / mm and 0.5 mm at a resolution of 16 lines / mm, so it cannot actually be said to be a large limit.

Depending on the system, the image data may be represented by R, G, B and converted into a coordinate system such as Y, U, V (brightness, color direction) with subsampling before encoding. Is done. In this case, it is necessary to read the block size according to the contents of subsampling.

Y: U: V = 4: 4: as shown in FIG.
4 × (ie no subsampling) 8 × 8
Although it may be a pixel as it is, Y: U: V = as shown in FIG.
4: 2: 2, Y: U: V = 4: 1: as shown in FIG.
In the case of 1, the boundaries may be considered by considering the blocks as 16 × 8 pixels and 16 × 16 pixels, and the same editing process may be performed.

The clipping and pasting of images according to the present invention will be further described below with reference to FIGS. FIG. 8 shows an example in which an image is cut out along a block boundary.
Since the image is cut out along the block boundary here,
The positions specified by the cursor at the upper left corner and the lower right corner of the image cut out in a rectangle are 8 pixels in the vertical and horizontal directions in the case of 8 × 8 pixels. For example, as shown in FIG. 8D, the cursor C is first located at P1 (x, y), then at P2 (x + 8, y + 8), and finally at P3 (x + 1).
6, y + 16). Thus, the cursor C
Is displayed at positions P1, P2, P3, but not between them.

When the cursor C is at the position P3, as shown in FIG.
When the mouse or the keyboard is clicked as shown in (c), this position is directly input as the position of the upper left corner of the cut image. As shown in FIG. 8B, the position of the lower right corner is also moved vertically and horizontally by 8 pixels in the same manner as P3, and is clicked at the position of P4 as shown in FIG. 8A. It is specified.

In the example of FIGS. 8A to 8D, the cursor C moves discontinuously in every 8 pixels in the vertical and horizontal directions, but the operator recognizes the exact cut-out position from the position of the clicked cursor. it can.

On the other hand, the cursor C can be continuously moved as shown in FIG. 9 (d). In this case, the operator uses the block boundary positions BP1 to BP4 shown in FIG.
Cannot be recognized from the position of the cursor C, and the upper left cutout position is clicked at the position P3 ′ of the cursor C. Then,
As described above, the block boundary position BP4 closest to the position P3 'is calculated and displayed as shown in FIG. 9 (b). The position at the lower right corner can be determined similarly. Figure 9
When clicked at the position P4 'in (b), the block boundary position BP8 closest to the position P4' is calculated and displayed as shown in FIG. 9 (a).

In the examples of FIGS. 9A to 9D, the cursor C continuously moves vertically and horizontally regardless of the block boundary position. When the operator designates a desired position as the cutout position with the cursor C, the block boundary position closest thereto is calculated as the cutout position. in this case,
The cutout positions BP4 and BP8 are click positions P3 ′ and P3.
Although slightly different from 4 ', the deviation is so small that the operator hardly notices the deviation.

Next, the operation of pasting the images cut out as shown in FIGS. 8 and 9 will be described with reference to FIGS. Here, the cut-out image B1 moves on the pasted image G2. The operation of FIG. 10 corresponds to FIG. 8, and FIG. 11 corresponds to FIG.

As shown in FIG. 10C, the cursor C
1 discontinuously moves every 8 pixels in the vertical and horizontal directions.
When clicked at the position shown in 0 (b),
As shown in (a), it is accurately pasted at the clicked position.

In the examples of FIGS. 11A to 11C, the cut-out image B1 continuously moves on the pasted image G2. When the image B1 is stopped at the position of FIG. 11C, the upper left corner position is surrounded by the block boundary positions BP9 to BP12. When the cursor C is clicked at the position of FIG. 11B, the upper left corner position of the cutout image B1 moves to the closest position of BP12 of FIG. 11A. In this case, the display position of the pasted image B1 is slightly different from the clicked position, but the shift is almost unnoticeable to the operator.

[0058]

As described above in detail, according to the present invention,
Since the phase of the cut-out image with respect to the block boundary is stored and pasting is performed at a position that matches the phase, the inside of the cut-out image is not deteriorated by re-encoding. Further, since the cut-and-paste edit is performed according to the block boundary of the encoding, the image quality deterioration due to the phase shift of the block does not occur even if the re-encoding is performed.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing the configuration of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a cutout image and a pasted image on the CRT display in FIG.

FIG. 3 is a flowchart for explaining a cutting and pasting operation in the image processing apparatus of FIG.

4 is a state change diagram for explaining a cutting and pasting operation in the image processing apparatus of FIG.

5 is a diagram for explaining a cutout image and a pasted image on the CRT display in FIG.

6 is a flowchart for explaining a cut and paste operation in the image processing apparatus of FIG.

FIG. 7 is a diagram showing an example of image data when a color difference signal is sub-sampled.

8A and 8B are views for explaining an image cutout operation in the image processing apparatus of FIG.

FIG. 9 is a diagram for explaining an image cutout operation in another embodiment of the image processing apparatus of the invention.

10 is a diagram for explaining an image pasting operation in the image processing apparatus of FIG.

FIG. 11 is a diagram for explaining an image pasting operation in another embodiment of the image processing apparatus of the invention.

FIG. 12 is a diagram for explaining a conventional data compression / decompression algorithm.

FIG. 13 is a diagram for explaining a mutual positional relationship between a cut-out image and a pasted image when performing a conventional cut-and-paste edit.

[Explanation of symbols]

CPU ... 1, 4 ... Display memory, 5 ... Encoder / decoder,
10 ... Mouse (keyboard), B1 ... Cutout image, b
p1 ... block, bp2 ... block, G2 ... edited image,
P1 (x1, y1) ... Cutting coordinate position, P2 (x2, y
2) ... The pasted coordinate position.

Claims (5)

[Claims] 1. A display having first and second display areas for displaying an image corresponding to image data, wherein the image displayed in the first display area is displayed in the second display area. Means, and encoding / decoding means for encoding the image data displayed on the display means in m × n pixel block units and for decoding the image data of the displayed image, (X, Y) Be the coordinates of the first point of the image displayed in the first display area, and (x, y) is the first coordinate when the image displayed in the first display area is displayed in the second display area. Means for calculating coordinates (x, y) of the second point satisfying X mod m = x mod m Y mod n = y mod n, where the coordinates of the second point corresponding to the point are The image displayed in the first display area and the image displayed in the second display area are m by the encoding / decoding means. n
The image displayed in the first display area is encoded into a block unit of pixels, and the image displayed in the first display area is displayed in the second display area according to the second coordinates (x, y) calculated by the calculating means. An image processing apparatus comprising: a control unit for displaying the image on the display. 2. A means for designating a first portion of the image displayed in the first display area, and a second image for displaying the image corresponding to the first portion in the display area. The image processing apparatus according to claim 1, further comprising: 3. The calculating means includes first specifying means for specifying a cutout position of the first display area, second specifying means for specifying a sticking position of the second display area, and the sticking. A means for converting the position coordinates (x, y) into a cutout position of the first display area, and a means for cutting out an image from the first display area and moving it to the pasting position of the second display area. The image processing apparatus according to claim 1, wherein: 4. A display having first and second display areas for displaying an image corresponding to image data, wherein the image displayed in the first display area is displayed in the second display area. Means, and encoding / decoding means for encoding the image data displayed on the display means in m × n pixel block units and for decoding the image data of the displayed image, (X, Y) Be the coordinates of the first point of the image displayed in the first display area, and (x, y) is the first coordinate when the image displayed in the first display area is displayed in the second display area. Means for calculating coordinates (x, y) of a second point satisfying X mod m = x mod m Y mod n = y mod n, when the coordinates of the second point corresponding to the point are used; Cursor display means for displaying a cursor on the second display area, and the cursor on the second display area. Cursor moving means for moving to a desired position, means for designating a desired position of the second display area by using the cursor moved by the cursor moving means, and closest to the desired position designated by the designating means The means for determining the coordinates (x, y), the image displayed in the first display area and the image displayed in the second display area are m × n by the encoding / decoding means.
The image displayed in the first display area is coded / decoded on a block-by-pixel basis in the second display area according to the second coordinates (x, y) calculated by the calculating means. An image processing apparatus comprising: a control unit for displaying the image on the display. 5. A display having first and second display areas for displaying an image corresponding to image data, wherein the image displayed in the first display area is displayed in the second display area. Means, and encoding / decoding means for encoding the image data displayed on the display means in m × n pixel block units and for decoding the image data of the displayed image, (X, Y) Be the coordinates of the first point of the image displayed in the first display area, and (x, y) is the first coordinate when the image displayed in the first display area is displayed in the second display area. Means for calculating coordinates (x, y) of a second point satisfying X mod m = x mod m Y mod n = y mod n, when the coordinates of the second point corresponding to the point are used; Cursor display means for displaying a cursor on the second display area, and the cursor on the second display area. A desired position of the second display area is designated by using a cursor moving unit that continuously moves to the second coordinate (x, y) position calculated by the calculating unit and a cursor moved by the cursor moving unit. Means, the image displayed in the first display area and the image displayed in the second display area are m × n by the encoding / decoding means.
The image displayed in the first display area is encoded into a block unit of pixels, and the image displayed in the first display area is displayed in the second display area according to the second coordinates (x, y) calculated by the calculating means. An image processing apparatus comprising: a control unit for displaying the image on the display.